Corrosion inhibition and statistical data of thiocarbanilide and thiocarbanilide admixed with 4-hydroxy-3- methoxybenzaldehyde on carbon steel in dilute acid media
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The inhibition performance of thiocarbanilide (TD) and thiocarbanilide admixed with 4-
hydroxy-3-methoxybenzaldehyde (TDHM) on the corrosion of mild steel in 1M H2SO4 and HCl
acid solutions was studied through coupon measurement. Data obtained showed the optimal
performance of TD is 71.69% in H2SO4 and 83.14% HCl acid solution respectively. TDHM
performed more effectively with optimal inhibition efficiency of 96.77% and 97.21% in both
acids. The result showed the performance of corrosion inhibiting compounds improves through
synergistic interaction with other compounds. However, exposure time and inhibitor concentration
strongly influenced the performance of the compounds at varying degrees. Statistical data shows
the standard deviation for inhibition efficiency of the compounds was significantly higher in
H2SO4 compared to HCl due to the high degree of variation analogous to exposure time and
stability of the inhibitor molecules. TD and TDHM generally showed lower standard of deviation,
higher mean value, lower margin of error and higher proportion of inhibition efficiency data above
70% inhibition performance. Statistical data from analysis of variance depict both exposure time
and inhibitor concentration is statistically relevant, and influences the inhibition performance of
TD and TDHM compounds. However, the influence of concentration is significantly limited
compared to exposure time with statistical relevance values above 60%
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TJ Mechanical engineering and machinery